OTELFINGEN Wastewater Treatment Plant, Otelfingen, Zürich, Switzerland

The OTELFINGEN wastewater treatment plant is located in Otelfingen, a municipality in the Bezirk Dielsdorf of the Canton of Zürich, Switzerland. It serves a population of about 6,158 residents, placing it in the small to medium agglomeration category. The plant is part of Switzerland's comprehensive wastewater infrastructure, which is regulated under the Swiss Federal Water Protection Act (Gewässerschutzgesetz). Swiss regulations require that all wastewater treatment plants meet stringent standards for effluent quality, typically including mechanical and biological treatment stages. For plants of this scale, secondary treatment is standard, and tertiary treatment may be required if the receiving water body is sensitive. It operates within a regulatory framework that ensures compliance with national and EU-aligned water quality objectives. The treated effluent from the OTELFINGEN plant is discharged into local watercourses that eventually drain into the Rhine River basin. The Rhine is a major European waterway that flows through Switzerland, Germany, and the Netherlands before reaching the North Sea. Protecting this river system is critical for downstream ecosystems, including fish habitats and drinking water supplies. The plant's operations contribute to maintaining the ecological health of the Rhine basin.

The OTELFINGEN plant discharges into small streams that feed into the Rhine River basin, which ultimately drains into the North Sea. The Rhine is a vital ecological corridor supporting diverse aquatic life, including migratory fish species. The plant's location in the Swiss plateau means its effluent enters a sensitive watershed that requires high treatment standards to prevent nutrient pollution and protect downstream water quality.